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<head>
	<meta charset="UTF-8">
	<meta name="viewport" content="width=device-width, initial-scale=1.0">
	<title>卡片三角阴影</title>
	<style>
		.reply-box {
			margin: 100px auto;
			width: 600px;
			position: relative;
			background-color: #fff;
			border-radius: 6px;
			filter: drop-shadow(0 0 6px rgba(0, 0, 0, 0.16));
			padding: 20px;
		}

		.reply-box::after {
			content: '';
			border-left: 10px solid transparent;
			border-right: 10px solid transparent;
			border-bottom: 10px solid #fff;
			position: absolute;
			top: -10px;
			left: 10%;
		}
	</style>
</head>

<body>
	<div class="reply-box">
		亲你好！我们的商品是没有问题的哦！非常经济实惠好用的啵家回复商家回复商家回复商家回复商家
	</div>
</body>

</html>